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Flange butterfly valve internal leakage problem: A pneu […]
Flange butterfly valve internal leakage problem: A pneumatic butterfly valve is installed on the lowering tube for feeding powder to the reaction kettle with a screw conveyor, and part of the solvent (acetone) will evaporate and reflux during the reaction. If the butterfly valve is leaking, it will increase the loss of solvent, and it will easily make the powder in the powder discharge tube agglomerate and block the pipeline.
The root cause of butterfly valve leakage is type selection. The internal sealing material form of butterfly valve is divided into soft seal and hard seal. If dust agglomeration cannot be avoided, other types of valves should be considered.
When testing the elastic flange butterfly valve, lay the side of the pressure ring upward, and place a pressure plate on the plane that is substantially the same size as the outer flange of the flange and the valve. If you use a pressure tester, the pressure claw should be pressed at This pressure plate makes the pressure evenly distributed on the pressure ring on the side of the valve body. If the blind plate is used for testing, generally the clip-on elastic flange butterfly valve is tested with two pieces of flange clamping. The flange-type elastic flange butterfly valve is sometimes used by the user for convenience. It is fixed with the valve bolt. At this time, the fixing screw on the pressure ring on the valve body must bear the full pressure of the medium. As mentioned earlier, these screws cannot withstand the pressure of the whole medium, so use a blind plate During the test, the valve does not leak, and it is the same as the actual state.